Considering the technology and materials available in the 30s, 40s, 50s and 60s, these "toys" are a marvel to me. Having worked in manufacturing design for 40+ years I have seen a huge change in product development methods. Today we have various computer tools, CAD design, 3-D printing, and simulation tools that eliminate a lot of error and the need for prototypes. I can't imagine what kind of model shop and tooling shop Lionel and Gilbert used to design and build their prototype products to evaluate and test. And they made the most out of every innovation they had. The vibrator motor was used in countless accessories and operating cars. I was shocked at how nice the chuffing tender was on a 325A American Flyer Steam Engine I recently acquired.
Back in the day, electricity was still a bit of a mystery. Being able to control a train remotely with a xfmr handle, make it whistle or dump coal at the push of a button was sort of magical. Today wireless technology, internet, and portable phone communication makes that look cumbersome and tired.
However, once you have been properly trained, there is still no substitute for the smell of ozone, smoke pellets and that wail of a mechanical air whistle.